TWI500545B - Electric vehicle, compound vacuum brake assist system and its driving method - Google Patents

Description

Electric vehicle, composite vacuum brake auxiliary system and driving method thereof

The invention relates to a vacuum brake auxiliary system for an electric vehicle and a driving method thereof, in particular to a composite vacuum brake auxiliary system with an oil and electric hybrid driving interface and a driving method thereof.

The traditional brake device adopts the pressure difference between the pressure of the vacuum state and the atmospheric pressure at the engine intake manifold to generate the auxiliary effect of the brake force. In the electric vehicle system, the motor is used as the power source for the vehicle, so there is no engine for the brake. The booster unit provides an auxiliary vacuum, so the vacuum can be achieved by replacing the engine with a vacuum pump.

When applying the above-described conventional steering system to the electric vehicle field, since the vacuum brake assist system cannot be operated by the engine, it is necessary to electrically drive the aforementioned vacuum brake assist system. However, the electric power of a general electric vehicle is mainly provided by a power battery. However, in addition to supplying the vacuum brake auxiliary system power, the power battery must also provide a power motor for driving the electric vehicle to travel, so the endurance of the electric vehicle during operation will be due to the attachment. The amount of system usage is limited by the mileage of the continuation.

The object of the present invention is to provide a hybrid power-driven vacuum brake assisting system and a driving method. The vacuum brake assisting system can be converted into an engine-driven mechanical vacuum pump in addition to electric power to enable the hybrid vacuum pumping operation. Brake assist, which in turn achieves the effect of auxiliary brakes fruit.

The composite vacuum brake assist system of the present invention comprises: a chamber for accommodating air. A pair of air passages are in communication with the chamber, the pair of air passages having an intake passage and an exhaust passage, respectively. A DC motor has a freely rotatable or electrically driven rotating shaft, the rotating shaft has a first end and a second end, and the first end is located in the chamber and is provided with an air extracting device. a one-way bearing is sleeved on the outer diameter of the second end of the rotating shaft. A pulley is disposed on the outer ring of the one-way bearing, and the wheel surface of the pulley is provided with at least one guiding groove.

The driving method of the composite vacuum brake assisting system of the present invention comprises: providing a composite vacuum brake assisting system according to claim 1 of the patent scope, the internal combustion engine is connected to the pulley by a belt, and the vehicle accessory battery system is electrically connected to the battery. The DC motor of the hybrid power vacuum pump; when a mode of mechanical energy is supplied to the hybrid vacuum pump power, the belt is driven by the engine to rotate the air pump to achieve a vacuuming effect, and the DC motor is switched The power supply circuit is an open circuit; and when a mode for starting the power supply to the hybrid vacuum pump power is started, the DC motor power supply circuit is switched to be a path to electrically drive the rotating shaft to rotate the air suction device to achieve a vacuuming effect.

The invention is characterized in that the patent provides a composite vacuum pump system without changing the original brake booster device, and the composite vacuum pump system can be converted into a mechanical vacuum pump in addition to the operation of the composite vacuum pump by electric power. Pu is driven by the engine to achieve the effect of assisting the brakes. In addition, the present invention can be combined with technical means such as brake recharging and the like, and does not There are other energy-saving technologies that reject other batteries. The device of the present invention can be provided by an electric vehicle or an extended-range electric vehicle, and can be installed in a conventional fuel vehicle, and can be realized by an architecture for charging the system, so that the versatility is extremely high.

1 is a perspective exploded view of a composite vacuum pumping embodiment of a composite vacuum brake assisting system of the present invention, and FIG. 2 is a composite power vacuum pumping embodiment of the composite vacuum brake assisting system of the present invention. Side view. The composite vacuum brake assisting system in this embodiment has a composite power vacuum pump that provides a suction suction force to assist the brake braking force, and the composite power vacuum pump includes: a chamber 30, an air passage 40, a direct current motor 50, and a single To the bearing 60 and the pulley 70. The chamber 30 has a space for accommodating air. The air passages 40 are disposed in pairs, and have an intake passage 41 and an exhaust passage 42. One end of the intake passage 41 and one end of the exhaust passage 42 communicate with the chamber 30, respectively. The DC motor 50 has a rotating shaft 51 that is freely rotatable or electrically driven. The rotating shaft 51 has a first end 511 and a second end 512. The first end 511 is located in the chamber 30 and is assembled. An air extraction device 5111 (for example, a centrifugal impeller). The one-way bearing 60 has an inner ring 61 and an outer ring 62 that are relatively rotatable in one direction, and the inner ring 61 is sleeved on the outer diameter of the second end 512 of the rotating shaft 51. The pulley 70 is assembled on the outer ring 62 of the one-way bearing 60. The wheel 71 of the pulley 70 is provided with at least one guiding groove 72.

As shown in FIG. 2, the above-mentioned composite vacuum brake assisting system 10 further includes: a brake booster 80 and a vacuum pressure sensor 90. brakes The booster 80 is in communication with the other end of the intake passage 42 by a vacuum source interface 81. The vacuum pressure sensor 90 is connected to the brake booster 80 to detect the vacuum value thereof, and transmits the detected monitoring signal m to the vehicle controller A (described later) on the vehicle.

Continuing to refer to FIG. 3, a block diagram of an embodiment of a mechanical energy operation state system for driving a hybrid vacuum brake assist system for an electric vehicle according to the present invention, and a composite vacuum brake for an electric vehicle of the present invention shown in FIG. A system block diagram of an embodiment of an electrical actuation state of a drive method of an auxiliary system. The electric vehicle 1 in the present example includes a vehicle controller A, an engine engine B (having a torque output shaft B1), a vehicle accessory system power supply battery C, and a hybrid vacuum brake assist system 10. The hybrid vacuum brake assisting system 10 includes a composite power vacuum pump 20 having a DC motor 50 electrically connected to the vehicle accessory system power supply battery C to drive the DC motor 50. The rotating shaft 51 is assembled to the pulley 70 through the one-way bearing 60, and the pulley 70 is connected to the torque output shaft B1 by a belt 73.

Further, the electric vehicle 1 may be an extended-range electric vehicle having a power battery D electrically connected to the vehicle accessory system power supply battery C (if the voltage is different, the voltage converter I can be connected), and the internal combustion engine The engine B is an engine that does not provide the traveling power of the electric vehicle 1. A generator E can be further connected to the internal combustion engine B. The generator E is electrically connected to the power battery D, and the power battery D can be charged by the generator E when the internal combustion engine B is actuated. The power battery D is electrically connected to a motor driver F to drive the power motor G connected to the motor driver F.

Please refer to FIG. 5 for a flow chart of the steps of the driving method embodiment of the hybrid vacuum brake assisting system of the present invention. In this embodiment, the driving method of the hybrid vacuum brake assisting system is applicable to a vehicle having an internal combustion engine B and a vehicle accessory system power supply battery C, particularly an electric vehicle 1 and an extended range electric vehicle. The driving method includes: Referring to FIG. 1 and FIG. 3 simultaneously, step S10: providing the composite vacuum brake assisting system 10 as described above, the internal combustion engine B is connected to the pulley 70 by a belt 73, and the vehicle accessory system power supply battery C is electrically connected to the composite power. The DC motor 50 of the vacuum pump 20; please refer to FIG. 3 at the same time, step S20: when a mode of mechanical power supply to the hybrid vacuum pump 20 is started (hereinafter referred to as engine mode), the torque output shaft of the internal combustion engine B B1 drives the belt 73, and the belt 73 drives the pulley 70 and the rotating shaft 51 (the inner ring 61 of the one-way bearing 60 and the outer ring 62 are not rotated relative to each other, and the rotating shaft 51 can be interlocked with the pulley 70) to rotate the pumping air. The device 5111 reaches the vacuuming effect and switches the power supply circuit of the DC motor 50 to be open.

Step 22 is further performed: when the vacuum pressure sensor 90 measures that the vacuum value of the brake booster 80 is lower than a safety value, the mode is forcibly switched to the mode in which the power is supplied to the hybrid vacuum pump 20 by electric energy.

After entering the engine mode, step S21 may be further performed: driving the DC motor 50 of the hybrid vacuum pump 20 with the torque output shaft B1 to generate electricity, and outputting power to the vehicle accessory system power supply C for charging.

Referring to FIG. 4 simultaneously, step S30: when a mode of power supply to the hybrid vacuum pump power is started (hereinafter referred to as a power mode), the straight line is switched. The power supply circuit of the flow motor 50 is a passage for electrically driving the rotating shaft 51 (at this time, the inner ring 61 of the one-way bearing 60 rotates relative to the outer ring 62, and the pulley 70 does not interlock with the rotating shaft 51) to rotate the air extracting device 5111 to achieve a vacuuming effect. .

After entering the power mode, the step S31 may be further performed: stopping the internal combustion engine B to drive the belt 73 by stopping the operation of the internal combustion engine B or losing the torque output shaft B1 of the internal combustion engine B to the belt 73. Friction between the belts.

Continue to step 32: when the vacuum pressure sensor 90 measures that the vacuum value of the brake booster 80 is lower than a safety value, forcibly switch to a mode in which the power of the hybrid vacuum pump 20 is supplied by mechanical energy, and disconnects the composite. The power vacuum pump 20 and the vehicle accessory system power the battery C's electrical path.

Step 33 is further performed: when a mode of supplying power to the hybrid vacuum pump 20 power is started, and the DC motor 50 is inoperable, the mode is forcibly switched to a mode in which the power of the hybrid vacuum pump 20 is supplied by mechanical energy.

In addition, as shown in FIG. 5, when the above-mentioned system is applied to an extended-range electric vehicle, the power battery D is electrically connected to the vehicle accessory system power supply battery C, and the internal combustion engine B is not provided with the electric vehicle traveling power. The engine, and determining the relationship between the residual power of the power battery D and the insurance power may determine the starting engine mode or the power mode, that is, the mode of starting the mechanical energy supply to the hybrid vacuum pump 20 is performed by step S11: when the vehicle is controlled The device A monitors that the residual power of the power battery D is less than or equal to a fuse power; and the mode of starting the power supply to the hybrid vacuum pump 20 is performed by step S12: when the vehicle controller A monitors the power battery D Triggered when the residual charge is greater than the fuse.

In summary, this patent provides a composite vacuum pump system without changing the original brake booster. This composite vacuum pump system can be converted into a mechanical vacuum pump in addition to the hybrid vacuum pump. Pu is driven by the engine to achieve the effect of assisting the brakes. In addition, the present invention can be combined with technical means such as brake recharging and the like, and does not exclude other energy-saving technologies for battery power. The device of the present invention can be provided by an electric vehicle or an extended-range electric vehicle, and can be installed in a conventional fuel vehicle, and can be realized by an architecture for charging the system, so that the versatility is extremely high.

The embodiments or examples of the technical means adopted by the present invention are not intended to limit the scope of implementation of the present patent. That is, the equivalent changes and modifications made in accordance with the scope of the patent application of the present invention or the scope of the invention are covered by the scope of the invention.

1‧‧‧Electric vehicle

10‧‧‧Combined vacuum brake assist system

20‧‧‧Composite power vacuum pump

30‧‧‧ chamber

40‧‧‧Air passage

41‧‧‧Inhalation channel

42‧‧‧Exhaust passage

50‧‧‧DC motor

51‧‧‧ shaft

511‧‧‧ first end

5111‧‧‧Exhaust device

512‧‧‧ second end

60‧‧‧ one-way bearing

61‧‧‧ Inner Ring

62‧‧‧ outer ring

70‧‧‧ Pulley

71‧‧‧90

72‧‧‧ Guide slot

73‧‧‧Land

80‧‧‧煞车倍力器

81‧‧‧Vacuum source interface

90‧‧‧Vacuum pressure sensor

A‧‧‧Complete vehicle controller

B‧‧‧ Internal combustion engine

B1‧‧‧Torque output shaft

C‧‧‧Vehicle accessory system power supply battery

D‧‧‧Power battery

E‧‧‧Generator

F‧‧‧Motor drive

G‧‧‧Power Motor

H‧‧‧speed detector

I‧‧‧Voltage Converter

m‧‧‧Monitor signal

Step S10, S11, S12, S20, S21‧‧‧ method step flow

Step S22, S30, S31, S32, S33‧‧‧ method step flow

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective exploded view of a composite power vacuum pumping embodiment of a composite vacuum brake assist system of the present invention.

2 is a side elevational view of a composite power vacuum pumping embodiment of the composite vacuum brake assist system of the present invention.

Fig. 3 is a block diagram showing an embodiment of an electric power actuation state system for driving a composite vacuum brake assist system for a vehicle according to the present invention.

Fig. 4 is a system block diagram showing an embodiment of a mechanically active state of a driving method of a hybrid vacuum brake assisting system for a vehicle according to the present invention.

FIG. 5 is a flow chart showing the steps of an embodiment of a driving method of the hybrid vacuum brake assisting system of the present invention.

10‧‧‧Combined vacuum brake assist system

20‧‧‧Composite power vacuum pump

30‧‧‧ chamber

40‧‧‧Air passage

41‧‧‧Inhalation channel

42‧‧‧Exhaust passage

50‧‧‧DC motor

51‧‧‧ shaft

511‧‧‧ first end

5111‧‧‧Exhaust device

512‧‧‧ second end

60‧‧‧ one-way bearing

61‧‧‧ Inner Ring

62‧‧‧ outer ring

70‧‧‧ Pulley

71‧‧‧90

72‧‧‧ Guide slot

73‧‧‧Land

Claims (13)

A composite vacuum brake assisting system has a hybrid vacuum pump that provides a suction suction force to assist a brake braking force, the composite power vacuum pump comprising: a chamber for accommodating air; and a pair of air passages, The chambers are connected to each other, and the pair of air passages respectively have an air suction passage and an exhaust passage; the direct current motor has a rotating shaft, and the rotating shaft has a first end and a second end, and the first end is located at the first end An air extracting device is disposed in the chamber; a one-way bearing has an inner ring and an outer ring, the inner ring is sleeved on the outer diameter of the second end of the rotating shaft; and a pulley is disposed in the one-way An outer ring of the bearing, the wheel surface of the pulley is provided with at least one guiding groove; wherein, when the pulley transmits the torque to the one-way bearing, the inner ring and the outer ring of the one-way bearing do not rotate relative to each other, and the rotating shaft and the rotating shaft The pulley is interlocked. When the rotating shaft of the DC motor transmits the torque to the one-way bearing, the inner ring of the one-way bearing rotates relative to the outer ring, so that the rotating shaft does not interlock with the pulley. The composite vacuum brake assist system of claim 1, wherein the air extracting device is a set of centrifugal impellers disposed at the first end. The composite vacuum brake assisting system described in claim 1 further comprises: a brake booster connected to the suction passage by a vacuum source interface And a vacuum pressure sensor connected to the brake booster to detect the vacuum value. An electric vehicle comprising: an internal combustion engine having a torque output shaft; a vehicle accessory system power supply battery; and a composite vacuum brake assist system as described in claim 1. An electric vehicle according to claim 4, wherein the electric vehicle is an extended-range electric vehicle having a power battery electrically connected to the vehicle accessory system power supply battery, and the internal combustion engine is not provided with an electric vehicle traveling power Engine. A driving method for a hybrid vacuum brake assisting system, which is suitable for a vehicle having an internal combustion engine and a vehicle accessory system power supply battery, the driving method comprising: providing a composite vacuum brake assisting system as claimed in claim 1 The internal combustion engine is connected to the pulley by a belt, and the vehicle is electrically connected to the DC motor of the hybrid vacuum pump by an accessory system power supply battery; when the mechanical energy is supplied to the hybrid vacuum pump power mode, the engine is driven by the internal combustion engine a belt for rotating the suction device to achieve a vacuuming effect, and switching the power supply circuit of the DC motor to be an open circuit; and when a mode for starting the power supply to the hybrid vacuum pump power is started, switching the DC motor power supply circuit to a path for electric driving The shaft, The vacuuming effect is achieved by rotating the suction device. The driving method of claim 6, further comprising stopping the driving of the belt after the step of switching the DC motor power supply circuit to electrically drive the rotating shaft. The driving method of claim 6, wherein the hybrid vacuum brake assisting system further comprises a brake booster and a vacuum pressure sensor, wherein the brake booster is connected to the vacuum source interface The passage is connected, and the vacuum pressure sensor is connected to the brake booster to detect the vacuum value. The driving method of claim 8, wherein when a mechanical energy is supplied to the mode of the hybrid vacuum pump power, and the brake booster vacuum value is lower than a safety value, the power is forcibly switched to The mode of supplying the hybrid vacuum pump power. The driving method of claim 8, wherein when a mode of supplying the electric power to the hybrid vacuum pumping power is started, and the vacuum value of the brake booster is lower than a safety value, the mechanical energy is forcibly switched. The mode of supplying the hybrid vacuum pump power is turned off, and the electrical path of the hybrid power vacuum pump and the battery for supplying the accessory system is disconnected. The driving method of claim 6, further comprising: driving the DC motor of the hybrid power vacuum pump with the torque output shaft when the starting a mechanical energy supply mode of the hybrid vacuum pump power To output power to the battery for the vehicle accessory system. The driving method of claim 8, wherein when a mode of power supply to the hybrid vacuum pump power is activated, and the direct current When the motor is inoperable, it is forcibly switched to a mode in which the combined power vacuum pump power is supplied by mechanical energy. The driving method of claim 6, wherein the vehicle is an extended-range electric vehicle having a power battery electrically connected to the vehicle accessory system power supply battery, and the internal combustion engine is not provided with an electric vehicle traveling power The engine, wherein the mode of the starter mechanical energy supply to the hybrid vacuum pump power is triggered by the residual power of the power battery being less than or equal to a fuse power, and the mode of starting the power supply to the hybrid vacuum pump power is by the power battery Triggered when the residual charge is greater than the charge.